I would like to encrypt an area_code column in my postgreSQL database with aes 256 encryption. Here is what happens.. I am able to encrypt it easily but I am not able to decrypt it.
Here is the encryption query that works fine:
update mytable t1 set area_code = t2.area_code from (select pgp_sym_encrypt(area_code,'Password', 'compress-algo=1, cipher-algo=aes256') as area_code,area_name from mytable) t2 where t1.area_name = t2.area_name;
However the decryption query does not seem to work if I give something like
update mytable t1 set area_code = t2.area_code from (select pgp_sym_decrypt(area_code,'Password') as area_code,area_name from mytable) t2 where t1.area_name = t2.area_name;
or even when I try to view the decrypted area_code
select pgp_sym_decrypt((select area_code from ci), 'Password') ;
The only thing that works is when I use a single record and feed in the encrypted text directly as input.
select pgp_sym_decrypt('aes.encrypted.string.given.as.input', 'Password') ;
You are supposed to store the encrypted data into a bytea column, not a text column. You might be able to cast it to bytea from text:
pgp_sym_decrypt(area_code::bytea,'Password')
Why don't you update the table directly, rather than doing a degenerate self-join on the update?